cosmic: Provide CosmicConfigEntry impl, use _ in property names

It seems to derive `CosmicConfigEntry`, we need to use `_` in property
names, because `_` isn't mapped to `-` and there doesn't seem to be a
mechanism like `#[serde(rename)]`.

It seems good to be consistent anyway. So this seems good to change,
unless we really like using `-` for names on disk, then cosmic-panel
needs to be changed.

`CosmicConfigEntry` also requires `PartialEq`, which is easy enough to
add.

This will break existing input settings, which will have to be
re-applied with the new locations. Cosmic-settings also need to be
updated for this.

cosmic-comp-config/src/lib.rs

@@ -1,11 +1,22 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+use cosmic_config::{cosmic_config_derive::CosmicConfigEntry, CosmicConfigEntry};
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 
 pub mod input;
 pub mod workspace;
 
-#[derive(Debug, Clone, Deserialize, Serialize)]
+#[derive(Clone, Debug, Default, PartialEq, CosmicConfigEntry)]
+pub struct CosmicCompConfig {
+    pub workspaces: workspace::WorkspaceConfig,
+    pub input_default: input::InputConfig,
+    pub input_touchpad: input::InputConfig,
+    pub input_devices: HashMap<String, input::InputConfig>,
+    pub xkb_config: XkbConfig,
+}
+
+#[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub struct XkbConfig {
     pub rules: String,
     pub model: String,